Description from Home Science Tools
These 250 ml Home Science Tools Erlenmeyer flasks are made of high-quality borosilicate glass that can be heated directly in an open flame. Use a #6-1/2 stopper for this glass flask. Flasks are used for mixing and heating and will withstand typical laboratory thermal variations common to chemistry processes like heating and cooling. The graduations are approximate and not intended for accurate liquid measurement.
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